Engine-starter.



Wfl.. MCGRATH.

ENGINE sTAmER."

APPLICATION FILEL AUGMZZ, 19H.

Patented Dec. 17, 1918.

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ENGINE STARTER.

APPLICATION FILED AuG.22. 1917.

1,288,086 Patented Dee. 17,1918.

W. L. MCGRATH.

ENGlNE STARTER.

APPLICATION FILED AuG.22, I9I1.

ll ,288,086. Patented Dec. 17, 1918.

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APPLCATlON FILED AUG.2Z| 19|7. l 1,288,086.' Patented Dec.17,1918.

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vv. L. MCGRATH.

ENGINE STARTER.

y APPLICATION FILED `AUG-22; 1912 ,2S8,0@ Patented DQC. 17, 1918.

6 SHEETS-SHEET 5.

ENGNE-STARTER.

Specification of Letters atent.

Patented u Application nled August 22, i917'. Serial No. 187,824.

To all iti/tom. it may concern:

y Be it knovvn that TVILLIAM L. l feGnATi-i, a citizen of the UnitedStates, residing at `Elmira, in the county of Chemung and State ,of NewYork, have invented certain neuT and useful improvements inEngine-Starters, of which the following is a speeitication. inventionrelates to eng'ine starters and the object. thereof is to provide asimple, efficient. and reliable construction of starter capable ofWorking in connection with either a starting motor alone or bpth astarting motor and a generator. My starter is also so constructed anddesigned as to be readily applied to internal combustion engines ofstandard manufacture or those nouv extensively in use.

ln the drawings Figure l is a plan view of my engine starter shovvnapplied to an automobile engine, a. portion of which engine is alsoshovvn but omitting the fan to morey clearly show the parts below; Fig.l a detail vieiv of a yielding drive for the starting motor sprocket;Fig. 2 a front elevation of the partsof-Fig. l; Fig. 8 an elevation ofthe drive portion or transmission of the starter device; Fig. 4 asectional elevation of the parts shown in Fig. 3; Figs. tO-S sections oncorresponding section lines of Fig. it; Fig. 9 a section on the lineeL-9 of Fig. 5; Fign@a a detail vieiv of the spring pressed pin orplunger; Fig. lO 'an elevation of a modified form of construc tion;`Fig.ll a section on the line ll-ll of Fig. l5; Fig. l2 a central section ofthe .parts shovvn in Fig. l0; Figs. 18 and lt sections on the lines ascorrespondingly indicated in Fig. l0; and Fig. l5 an elevation ofthe,sleeve shovvn in section in Fig. l2, with the pulley in section.

Referring t0 the embodiment of my invention as herein shown in Figs. lto 9, the

internal combustion engine is indicated atr the electric starting motorat B and the generator at C, such motor and generator being bypreference suit-ably mounted upon the engine frame.. The engine isprovided with the usual crank shaft a projecting for' Wardly of thelfront plate A of the engine. otivithstanding the installation of mypovver starting device the usual starting crank D with its' clutch jaw Zadapted to engage the crankshaft for cranking the motor or engine byhand, is retained.

Referring more particularly to Figs. 3 and l, my driving devicecomprises the .following parts: To a suitable supporting member vvhichis here the front plate A of the engine, there is-secured as by'means ofthe stud l a flanged plate 2 forming an outstanding bearing 2. receivingthe inwardly extending hub 3 of a ivheel which, as to the drive itself,may be considered the driving vrheel and which. as shovvn and bypreference,'is a sprocket Wheel et.

. Freferably the sprocket Wheel and its hub are made in tivo parts,being secured together by -the rivets passing through the sprocketivheel and the flange 3"l of the hub portion. rlhe outer face of thishub flange is provided with or vformed as a. clutch face by having aseries of clutch javvs with shoulders for driving in one direction byengagement ivith a complementary clutch face oi jaw hereinafterdescribed. rFhis hub flange and its clutch face forms one member of aclutch which is normally in disengaged or inoperative position as shownin Fig. 3.

`Within the sprocket hub, axially thereof, is a sleeve 7 vvhich is.secured in suitable manner as by means of the cross pin S to the crankshaft a of the engine.y rFhis pin is held in place in suitable manner,but l prefer the means shown in detail in Figs. -t and 5, consisting ofshort pins 9, passing transversely through the pin 8 on opposite sidesof the crank shaft and through the' sleeve 7. rlhis sleeve 7 extendsforwardly of the outer end Iof the crank shaft and is provided near itsouter end With a cross pin 10, which is adapted to be engaged `by theclutch jaw (l when cranking by hand.

This pin l0 is held in place in suitable man'- ner as by means of thesmall cross pins ll, Figs. e and S. Y

The large pin l0 serves as a means for securing to the sleeve 7 a vvheelWhich is here shoivn and is by preference a pulley Wheel l2 over whichtravels the belt 13. In the present instance being described, this beltdrives the generator C by means of its pulley c and the fan, indicatedat E, by means of the pulleye, but it will be understood that thisdriving of either the fan or j generator, or both, through the driveabout to be described in detail, may be dispensed with and the driveutilized only for engine .starter purposes. In that case, the pulleywheel is not necessary.

An outer or clutch sleeve 14 fits over the sleeve 7 and is provided atits outer end with alia'nge 4portion bearing against the inner sideofthe pulley. Springs seated in sockets in the pulley wheel and saidiiange portion serve to hold the latter inwardly, that is,longitudinally toward the left (Fig. 4), so that the pin 8 bottoms intheslot of this sleeve. .This construction permits of manufacturingtolerances without the usual resultant looseness which would causevibration and noise, but on the contrary prevents or damps any possiblevibration or noise. This outer sleeve is adapted to be detachablyconnect-ed with the inner sleeve 7 for readily assembling anddisassembling. As herein shown the sleeve 14 is provided with twodiametrically opposite sl0ts'14a entering-.from the inner end, of the4hub and adapted to receive the ends ofthe pin 8. The springs 15 ac tto` hold the outer sleeve inwardly to full extent so that the bottom gof the slots will contact the pin 8 and receive the full bearing.thereat. This pulley wheel and outer sleeve might be made in one pieceso far as functioning 1s concerned,

but are preferably made separate to give the seating action describedonto the pin, and also because the Wheel is made of cast'iron and thesleeve of steel.

The liange portion 14, has on its inner side a clutch face or series ofjaws 16 complementary to the jaws 6, the two sets of jaws forminglmembers of the automatically acting clutch herein before referred to.The clutch jaws 16 may be madeseparate from or integral with such hubflange. 'These jaws 6 and 16 are not right angled with respect to theflanges but, by preference, are undercut so that when engaged at theirouter ends, they will have a tendency to draw together in full clutchingposition.

The sprocket wheel-hub 3 is capable both of rotary movement within thebearing 2 and also of a longitudinal or axial movement therein. Meansare provided for enforcing such longitudinal movement automatically as aresult of the rotation of the-sprocket wheel 4. As herein shown suchmeans consist of a-spring-pressed pin operating in said bearing andadapted to cooperate with grooves and cross 'grooves inthe periphery ofthe sprocket hub. As shown in detail in Fig. 9 this hub is vprovidedwith two parallel peripheral grooves 17 and 18, the outer one 17 ofwhich is continuous and the other 18 which by preference isnon-continuous, be

ing divided in asmany sections as there areA 'inclined cross orcommunicating grooves 19 between the two peripheral grooves. The

wardly spring-pressed by means of the crank shaft a through the sleeve14, and pin pin 2O Works in a cylinder 21 which is shown screw-threadedthrough the bearing and closed by an end plug 22 also forming a bearingfor the plunger. This pin is inspring 23 which projects thel inner endof the pin against the sprocket hub and into cooperation with saidgrooves. Normally, the sprocket hub is positioned within its bearing asshown in Fig. 9, but when the sprocket. wheel is rotated by means of thestarting motor the pin which is now resting in one of the sections ofthe groove 18 will enter one of the cross grooves 19, and as the pin isstationarily fixed except as to its longitudinal movement, the continuedrotation of the hub will cause such hub to move longitudinallyoutwardly, that is to the right in Fig. 9 un til such pin enters theother groove 17. This longitudinal movement brings the movable clutchface or jaws 6 into clutching engagement with the clutch face or jaws16, with the result that the rotary movement of the sprocket wheel willbe transmitted tothe J 8. The described mounting of the sprocket wheel 4and its hub gives the advantage of removing the starting strain from thecrank shaft and putting it onto the stationary supporting member..

When the engine starts on its own power with speed in excess of -thatlwhich was thus transmitted thereto, the clutch jaws will beautomatically separated by the cam action of their adjacent inclinedfaces, and the sprocket wheel and its hub will be restored to normallongitudinal position. In this disengaging action', the pin 20 does notnecessarily follow the cross grooves but, in effect jumps directlyacross from one circumferential groove to the other. The crank shaftbeing now driven by the engine itself, power will be transmitted' fromsuch engine through the inner sleeve 7 and *pulley 12 to the generatorand the fan. In case of back fire, the clutch jaws will beAautomatically separated by reverse rotation, the action being similar tothat previously described. The relative distance between the peripheralgrooves and depth of clutch jaw together with width of roove anddiameter of pin are such that w en lthe clutch is, disengaged in themanner just described the` pin 20 will be at the outer rounded edge ofthe groove 17 and the pressure thereon-will force it into the groove,thereby still further separating the clutch jaws to give properallowance and holding them apart, regardless of any vibratory effectuntil the next starting op-A eration.

. lVhile the means shown for automaticallyv and longitudinally movingthe sprocket wheel and its hub, operates successfully in practice, vet Iprefer to provide means for assisting in this automatic movement. Asshown in 130 CII i ,eeaoee Fig. 1 the starting motor B has a smalldriving sprocket wheel L operatively connected with the driven sprocketVwheel l by the sprocket chain 2l. )is shown in Fig. 1 these two sprocketwheels are in disalinement when thed sprocket wheel l is in its normalor inoperative position. but are in alinement when the latter is in itslongitudinally shifted or operative position. doing its driv. ing non;Tfiflien the `motor is started and the sprocket wheels thereby rotated.there is a tendency ot the sprocket chain to pull the driven soroclet.wheel l over into alinement with vthe drivingsprocket wheel 7;. Adexible driving connection which includes the chain is not essential, asthe same action can bc produced by a spiral gear drive. Tfhcn thedescribed undercut clutch jaws are used. a less degree of disalinementoi? driving chain may be employed. it being necessary only to bring theclutch members rinto partial engagement. whereupon they willautomatically come into full engagei ment.

rllhe hub while concentric otl the sleeves T and 1l is sepa atedtherefrom by an annular space and consequentlyv they have no bearing oneach other and such huh is entirely tree therefrom when the clutchisdisengaged. rllhus. when the engine is running on its own power, thereis no constantly running bearing in the drive device.

in Figs. 10 to 15 l have shown a modified form ot' constructionbutembodying the same general principles of construction and mode otloperation. According to this con-l struction the crank shaft (I isprovided with a sleeve Q5 to which secured in suitable manner as bymeans of the large pin Q6 the pulley wheel QT similar to the wheel 12 ofthe other construction. rthis sleeve is provided at its'out-er end witha pin QS adapted to be engaged by the clutch jaw (Z oit the hand crank.

Upon the sleeve is mounted tor both rotary and longitudinal movement asprocket wheel 29 having a hub BOpreterablyformed separate from thewheel and secured thereto in suitable manner as by means oit the. studs31. rfhis sprocket hub is provided on its inner face or has such taceformed as a clutch jaw 32, which is adapted to engage the pin 2S whenmoved inwardly to engaging` position, with the result that such sprocketwheel is adapted to drive the pulley wheel 2T and 'the c-ranlr shaft ain one direction only.

The sprocket wheel and its hubgire adapted to be moved longitudinallyautomatically. that is axially with respect to itself and the sleeve 25.Means somewhat similar td those yhereinbefore described are provided forthis purpose. However, in this instance the two peripheral grooves 33and 3l are both continuous, and are connected by the inclined crossgrooves The spring-pressed pin 2O is exactly the same as that alreadydescribed but in this instance is mounted on the rotatable element. lnorder to cause operative action of this pin the cross grooves are oftdililerential or greater depth than the circumferential grooves. withthe result thatthe pin will follow a cross groove when pre,- sentedthereto instead ot following the circumferential groove.

In this moditied constriuftion` therc` is a constantly rotating bearingwhen the engine is running. inasmuch as the sprocket wheel Q9 and itshub are mounted on thesleeve 25 and are stationary when such slccve isrotating under the driving action ot the engine. To lubricate thisbearing. the interior ot the.

rsleeve Q5 extending beyond the cud ot the crank shattV is formed as achamber It. to contain the lubricant. by closing the outer end of suchsleeve in suitable manner as b v means of a plate 3T. which is securedin place by a screw 38 entering the pin 2S and serving to hold thelatter in place. Holes Z39 dcliver the lubricant to the bearing.

It desired, a yielding .driving conne-tum may be interposed somewhere inthe train ot driving connections between the starting mo tor and thecrank shaft. ln the present instance such yielding driving connection isshownassociated with the sprocket wheel 71. As shown in Fig. l thearmature shat't 7) passes loosely through the sprocket and is' connectedto a driving head or collar 40 which is connected with the sprocket' bya coiled driving spring' 41.

l do not herein claim the specilic construeA tion of the modified torniillustrated in Figs. 10-15 but have made the same. the subject matter ofanother application led Octobc:` 17. 1917. Serial Number 197.169.

claim:

1. ln combination with a rotatable member ot the engine to be started. arotatable and axially movable wheel arranged concentric thereof andprovided with a clutch means.r a second clutch means connected with saidmember and arranged in the path ot` movement of the first. named clutchmeans. and means for automatically moving the dr\ ing wheel to bringsaid two clutch means into cagagement. s

2. ln combination with a rotatable member ot the engine to be started. adriving' wheel arranged concentric ot' such member. a. driven member aranged concentric ot the engine member and connected with such member,and means Jfor automatically moving the driving wheel into engagementwith the driven member.

3. ln combination with a rotatable member ot the engine to be started. adriving wheel arranged concentricl of such member, a driven memberarranged concentric thereof and of the engine member and operativelyconnected with lsuch latter member. said llo lit).

berof the engine to be started, a driving Wheel having a hub concentricWith such member and provided with a. clutch face, Va driven clutchsleeve connected With' suchv `member and. concentric Withv said hub, and

means for 'automatically moving the driving wheel and clutch faceaxially into operative engagement with said clutch sleeve.

6. In combination with a rotatable member of the engine to be started,adriving Wheel having a hub concentric with such member and provided atone end with a clutch face, and a sleeve concentric of the hub andconnected with the engine member. such sleevehaving an yend flangeprovided on its inner side with a. clutch face complementary with theother clutch face, said hub being mounted for rotary and axial movement,the clutch faces being brought together in such axial movement.

7. In combination `vvith a rotatable member of the engine to be started,a fixed bear-f ing wheel having a. hub coperating with such bearing forboth rotary and axial movement and also arranged concentric of theengine member, said Wheel having a clutch face, and a sleeve arrangedconcentrically,

Within the hub` and its bearing and connected With the engine member,said sleeve having a clutch face adapted to coperate with the otherclutch face.

8. In combination with a rotatable member oftheengine to be started,afixed bearing concentric of the engine member, a driving Wheel having ahub coperating With such bearing for both rotary and axial movement andalso arranged concentric ofthe engine inember, said Wheel having aclutch face, and 'a sleeve arranged concentrically Within the hub andits bearing and connected with the engine member, said sleeve being outof bear-4 i ing contact With. said hub andv its bearing and having aclutchgface adapted `to cop-v erate With the other clutch face.

9. In combination with ashaft of the enl gine to be started, a bearingmember, a driving member supported thereby vfor rotary and axialmovement and having a'clutch face, means associated. with such membersfor .automatically moving the driving meming concentric of the enginemember, a driv ber axially when it is rotated, and a clutch gine to bestarted, a bearing member, a driving member supported thereby for rotaryand axial movement and having a clutch face, means associated With suchmembers for automatically moving the driving member axially When it isrotatedconsisting of a yielding pin in one member and grooves in theother member coperating With such pin, and a clutch sleevearrangedconcentrically Within the driving member and connected Withthe engineshaft, such sleeve coperating with said clutch face.

1l.- In combination With a rotatable member of the engine to be started.a rotatable driving Wheel having` a hub concentric of said memberandmovable axially, a sleeve connected with said member, and a clutchsleeve connected With the engine member, such clutch sleeve and hubhaving comple.- mentary clutch faces.

12. In combination with a rotatable member of the engine to be started,a rotatable driving Wheel having a hub concentric of said member andmovable axially. a sleeveI connected with said member, a clutch sleeveconnected With the engine ."member. such clutch sleeve and hub havingcomplementary clutch faces, and means for automati-` cally moving thedriving Wheel axially and therebycausing clutch engagement.

13. In combination With a rotatable mem-y ,i

ber of the engine to be started, a driving Wheel having a hub concentricof saidmember and movableaxially, a sleeve secured to said member, asecond sleeve fitting upon the first sleeve and alsovsecured to saidmember, such second sleeve and hub having complementary clutch faces.

14. In combination with a rotatable member of the engine to be started.a driving Wheel having a hub concentric of said member and movableaxially, a sleeve secured to said member, a second sleeve fitting uponthe rst sleeve and also secured to said member, such second sleeve andhub having complementary clutch faces. and means for automaticallymoving said driving ivheel axially and thereby causing clutchengagement.

15. In combination with a rotatable member vof the engine to be started.a rotatable driving.. Wheel having a hub concentric of said member andmovable axiallv.a sleeve connected With Said member. a driven Wheelsecured thereto, a clutch sleeye connected With theengine member, suchclutch sleeve and hub having complementarv clutch faces, and yieldingmeans tending to hold the driven Wheel and clutch sleeve separated.

16. In combination with a rotatable memnasaoee :a

ber of the engine to be started, a rotatable driving Wheel having a hubconcentric of said member and movable axially, a sleeve connected withsaid member, a driven Wheel -1 secured thereto, a clutch sleeveconnected with the engine member, such clutch sleeve and hub havingcomplementary clutch faces, and springs interposed between the driven`wheel and clutch sleeve tending to hold them separated.

l?. The combination or a shaft of the engine to be started, providedvvith a projection, a driving Wheel having a hub conceiitric of saidshaft and movable axially, said hub having a clutch face, a sleevesecured to said. shaft through such projection, a clutch sleeve ttingover the first sleeve and cooperating with the clutch face, said clutchsleeve having a slot to receive the projection,

a driven Wheel secured to the first sleeve.

and means between the driven wheel and clutch sleeve tending to hold thelatter in full engagement with lsaid projection.

i8. The combination of a shaft of the engine to be started, providedWith a projection, a driving Wheel having a hub concentric of said shaftand movable axially, said hub having a clutch tace, a sleeve secured tosaid shaft through such projection, a clutch sleeve iitting over theirst sleeve and 'cooperating With the clutch face, said clutch sleevehaving a slot to receive the projection, a driven Wheel secured to thefirst sleeve, and springs interposed between the driven Wheel and clutchsleeve tending to hold the latterin full engagement With saidlprojection.

19. ln combination With a rotatable member of the engine to be started,a vdriving Wheel having a hub concentric of said member and movableaxially,'a clutch sleeve se cured to said member by detaching meansincluding' a cross pin in such engine member, the sleeve being slottedto receive a pin, and a driven Wheel having a hub detachably secured tosaid engine member through said pin, said hub and clutch sleeve havingcom-v plementary clutch faces.

20.` ln ,combination With a rotatable member of the engine to bestarted` 'a driving Wheel having a hub concentric of said member andmovable axially, a sleeve secured to a means to be engaged by a handcrank, a clutch sleeve tting upon the i'irst sleeve and also secured tothe engine member, said hub and clutch sleeve having complementaryclutch Jfaces.

22. ln combination with a rotatable member ot the engine to be started,a driving Wheel having a hub concentric of said mem ber and movableaxially, a sleeve secured to said member, and having at its .outer end across pin to be engaged by a hand crank, a clutch sleeve itting upon thefirst sleeve and also secured to the engine member, said hub and clutchsleeve having complementary clutch., faces.

23. ln combination with a rotatable shaft of the engine to be started, adriving Wheel having-a hub concentric With the shaft and provided with aclutch face, said Wheel and and axial movement and having a clutch face,a clutch sleeve secured to the shaft and coperating With the clutchtace, and means for automatically moving the driving meniber axially'tocause clutch engagement consisting of a yielding pin in one of the memenl bers, and two circumferential grooves in the other member, saidgrooves being connected by inclined cross grooves and one of thecircumferential grooves being interrupted at intervals, and said pincoperating with said grooves.

25. ln combination With a rotatable member of the engine 'to be started,a driving Wheel having ahub mounted for rotary and axial movement andhaving a clutch face, a clutch sleeve secured to the engine member andcoperating with the clutch face, and means for automatically so movingsaid Wheel axially consisting ot a pin" and tivo circumferential groovesin the hub and inclined cross grooves connecting them, one of thegrooves being interrupted at intervals, and said pin coperating withsaid grooves. y

26. ln combination With a rotatable member of the engine to be started,a driving Wheel having a. hub mounted for rotary and axial movement andhaving a clutch face, a clutch sleeve secured to the engine member andcooperating with the clutch tace, and

- means for automatically so moving said Wheel axially consisting of apin and tvvo circumferential grooves in the hub and inclinedcross-grooves connecting them, one

of the circumferential grooves being so relatively located with respectto the clutch face that when such face is initially disengaged from theclutch sleeve byreverse or withdraival movement of the hub said pin willbe at the edge of said particular groove and will be forced t-hereintoto further withdraw ifihe hub and provide clearance at the clutch aces.

27. In combination with a rotatable member of the engine to be started,a driving wheel having a hub concentric of said member and movableaxially, said hub having a. clutch face, a sleeve secured to said memberand having at its outer` end a cross'pin to be engaged by a hand crank,a driven wheel detachably secured to said sleeve by said pin, and aclutch sleeve coperating with such clutch face and also secured totheengine member.

28. In lcombination with an engine Shaft, a supporting bearing, adriving wheel having a hub arranged within said bearing and having botha rotary and longitudinal axial movement therein, a clutch sleeve alsose cured to the shaft and coperating with said hub, said clutch sleeveextending within the hub but out of contact therewith.

29. In combination with an engine shaft, a supporting bearing, a drivingwheel having a hub arranged within said bearing and having both, arotary and axial movement therein, a clutch sleeve secured to. the shaftand coperating with the hub within which it extends but from which it isseparated by an annular space, and a second sleeve secured to the shaftand arranged within the clutch sleeve, the driven wheel being mounted onthe second sleeve.

30. In combination with a rotatable shaft of the engine to be started, adriving wheel mounted 4concentric of the shaft and movable axially, aclutch sleeve secured to the rshaft and cooperating with the drivingwheel for driving purposes, a driven wheel and a sleeve secured to andextending beyond the end of the shaft, said second wheel being securedto the latter sleeve.

31,. In combination with a rotatable shaft of the engine to be started,a driving wheel mounted concentric of the shaft and movable axiallyJ adutch sleeve secured to the shaft and coperating with the driving wheel,a sleeve secured to and extending beyond the end of the shaft, and aprojection on the extended end of the sleeve for engagement by a handcrank.

32. In combination with a rotatable shaft of the engine to be started, adriving wheel mounted concentric of the shaft and movable axially, aclutch sleeve secured to' the shaft and coperating with the drivingwheel, a driven wheel, a sleeve secured to and extending beyond the endof the shaft, and a cross pin in such sleeve for securing the sec-v ondwheel thereto and for engagement by a hand crank.

34. In combination with a rotatable member-of the engine to be started,al driving wheel having a hub concentric with such member and providedwith a clutch face, a

driven clutch sleeve connected with such member and concentric with saidhub, and means for automatically moving the driving wheel and clutchface axially into operative engagement with said clutch sleeve, a primemover, an initial driving wheel operatively connected with said firstnameddriving l wheel, and a yielding driving connection between theprime mover and driving wheel. y

35. In combination with a rotatable member of the engine to be started,a driving the said initial wheel having a hub concentric with such Ymember and provided with a clutch face, a driven clutch sleeve connectedwith such member and concentricwith said hufb, and means forautomatically moving the driving wheel and clutch face axially intooperative engagement with said clutch sleeve, a prime mover, an initialdriving wheel operatively connected with said first named driving wheel,and a spring drive between the prime mover and the said initial drivingwheel. c y

36. An engine 'starter' drive including a pair of clutch members, thefirst of which is connected with the engine to be started, andthe secondof which is movable into and out of engagement with the first member, a

'driving wheel, a driven wheel driven thereby the latter wheel beingconnected with said second clutch member and being out of alinement withthe driving wheel when such sec'i ond member is in unclutched position,and a flexible driving connection between, said two wheels which tendsto draw the wheels into alinement when operating.

37. In combination with a rotatable member of the engine to be started,a driven wheel arranged concentric of such member and having -aclutchmember, a second clutch member secured to the engine member andcoperating with the first clutch member, a main driving wheel fordriving the driven wheel, the latter wheel being out of alinement withthe main driving wheel when such second member is in unclutchedposition, and a driving connection between the `main driving wheel andthe driven wheel which tends to draw such wheels into alinement whenoperating. i

38. In combination with a rotatable member of the engine to 'be started,a driving wheel, a driven wheel arranged concentric of such Ymember andcarrying a clutch member, a second clutch member secured to the enginemember, said wheels being in disalinement when the clutch members areinoperative, and a driving connection between said two wheels', wherebythe wheels are' brought automatically into alinement when rotated.

39. In combination with a rotatable member of the engine to be started,a driven wheel having a clutch face and axially movable, a clutch sleeveconnected with the engine member and cooperating with the first clutchJface, means associated with the driven wheel for automatically movingit axially, a driving wheel in disalinement with the driven wheel, and adriving transmission between thetwo wheels, thedisalinement tending tomove the driven wheel axially into engagement with the clutch sleeve.

I0. In combination with a rotatable shaft of the engine to be started, arotatable driven wheel adapted to move axially and having a clutch faceconsisting of undercut teeth`r a second clutch face connected with theshaft and having complementary teeth, means associated with the drivenwheel for automatically moving it axially, a driving wheel indisalinement with the driven wheel,

and a driving transmission between the two wheels, the disalinementtending to move the driven wheel into engagement with the second clutchface.

ALn engine starter drive including a. pair of clutch members, the rst ofwhich is connected with the engine to be started and the second or'which is movable into and out of engagement with the first member, adriving wheel, a wheel driven thereby and connected with said secondclutch member, said wheels being out of alinement with the driving wheelwhen such second member is in unclutched position and in alinement whenin clutched position, and a eXible driving connection between said twowheels which tends to draw them into alinement when operating. Y 42. Anengine starter drive including a pair of clutch members, the first ofwhich is connected with the engine to be started and the second of whichis movable into and out of engagement with the rst member, a drivingsprocket wheel, a sprocket wheel driven thereby and connected with saidsecond clutch member, said wheel being out'of alinement with the drivingwheel when such second member is in unclutched position and in alinementwhen in clutched position. and a sprocket chain between said two wheelswhich tends to draw them into alinement when operating.

-WILLIAM L. MCGRATH.

